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.IX Title &quot;RAND_SET_RAND_METHOD 3&quot;
.TH RAND_SET_RAND_METHOD 3 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
.\&quot; For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH &quot;NAME&quot;
RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL \- select RAND method
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/rand.h&gt;
\&amp;
\&amp; RAND_METHOD *RAND_OpenSSL(void);
\&amp;
\&amp; int RAND_set_rand_method(const RAND_METHOD *meth);
\&amp;
\&amp; const RAND_METHOD *RAND_get_rand_method(void);
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random number
generation.
.PP
\&amp;\fBRAND_OpenSSL()\fR returns the default \fB\s-1RAND_METHOD\s0\fR implementation by OpenSSL.
This implementation ensures that the \s-1PRNG\s0 state is unique for each thread.
.PP
If an \fB\s-1ENGINE\s0\fR is loaded that provides the \s-1RAND API,\s0 however, it will
be used instead of the method returned by \fBRAND_OpenSSL()\fR.
.PP
\&amp;\fBRAND_set_rand_method()\fR makes \fBmeth\fR the method for \s-1PRNG\s0 use.  If an
\&amp;\s-1ENGINE\s0 was providing the method, it will be released first.
.PP
\&amp;\fBRAND_get_rand_method()\fR returns a pointer to the current \fB\s-1RAND_METHOD\s0\fR.
.SH &quot;THE RAND_METHOD STRUCTURE&quot;
.IX Header &quot;THE RAND_METHOD STRUCTURE&quot;
.Vb 8
\&amp; typedef struct rand_meth_st {
\&amp;     int (*seed)(const void *buf, int num);
\&amp;     int (*bytes)(unsigned char *buf, int num);
\&amp;     void (*cleanup)(void);
\&amp;     int (*add)(const void *buf, int num, double entropy);
\&amp;     int (*pseudorand)(unsigned char *buf, int num);
\&amp;     int (*status)(void);
\&amp; } RAND_METHOD;
.Ve
.PP
The fields point to functions that are used by, in order,
\&amp;\fBRAND_seed()\fR, \fBRAND_bytes()\fR, internal \s-1RAND\s0 cleanup, \fBRAND_add()\fR, \fBRAND_pseudo_rand()\fR
and \fBRAND_status()\fR.
Each pointer may be \s-1NULL\s0 if the function is not implemented.
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
\&amp;\fBRAND_set_rand_method()\fR returns 1 on success and 0 on failure.
\&amp;\fBRAND_get_rand_method()\fR and \fBRAND_OpenSSL()\fR return pointers to the respective
methods.
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBRAND_bytes\fR\|(3),
\&amp;\fBENGINE_by_id\fR\|(3),
\&amp;\s-1\fBRAND\s0\fR\|(7)
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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